Studies of thin-film growth, adsorption, and oxidation by in situ, real-time, and ex situ ion beam analysis

Yuping Lin, Robert P. H. Chang

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A time-of-flight (TOF) ion scattering and direct recoil spectrometer (ISS/DRS) has been developed to study the surface composition and reconstruction of metals, metal-oxides, and semiconductors, and to provide in situ characterization of the thin-film deposition process. The in situ, real-time study of Pb, Zr, and Ru ultrathin films produced by ion beam sputter deposition is presented here as the first demonstration of TOF-ISS as a means of characterizing monolayer and submonolayer growth, both in UHV and in mTorr oxygen background. The capability of performing surface analysis at pressures >10”3 Torr is unique to pulsed ion beam surface analysis among surface analytical methods and enables the in situ monitoring of oxide thin-film growth processes and surface-gas phase reactions. Using angular-resolved ISS combined with Auger electron spectroscopy, we studied the oxygen adsorption and reconstruction of (001) oriented InSb thin-film surfaces. It was found that the adsorption of molecular oxygen on the InSb (001) surface is consistent with the Langmuir model. Oxygen adsorption preferentially occurs on the antimony sites corresponding to the extension of the lattice into the vacuum and reduces the inward contraction of the first two layers of the clean InSb (001) surface relative to the bulk atomic spacing.

Original languageEnglish
Pages (from-to)1557-1564
Number of pages8
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume12
Issue number4
DOIs
Publication statusPublished - 1994

Fingerprint

Film growth
Ion beams
ion beams
Adsorption
Thin films
Oxidation
oxidation
adsorption
thin films
Surface analysis
Oxygen
International Space Station
Metals
oxygen
Antimony
Time and motion study
Sputter deposition
Surface reconstruction
Molecular oxygen
Ultrathin films

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

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abstract = "A time-of-flight (TOF) ion scattering and direct recoil spectrometer (ISS/DRS) has been developed to study the surface composition and reconstruction of metals, metal-oxides, and semiconductors, and to provide in situ characterization of the thin-film deposition process. The in situ, real-time study of Pb, Zr, and Ru ultrathin films produced by ion beam sputter deposition is presented here as the first demonstration of TOF-ISS as a means of characterizing monolayer and submonolayer growth, both in UHV and in mTorr oxygen background. The capability of performing surface analysis at pressures >10”3 Torr is unique to pulsed ion beam surface analysis among surface analytical methods and enables the in situ monitoring of oxide thin-film growth processes and surface-gas phase reactions. Using angular-resolved ISS combined with Auger electron spectroscopy, we studied the oxygen adsorption and reconstruction of (001) oriented InSb thin-film surfaces. It was found that the adsorption of molecular oxygen on the InSb (001) surface is consistent with the Langmuir model. Oxygen adsorption preferentially occurs on the antimony sites corresponding to the extension of the lattice into the vacuum and reduces the inward contraction of the first two layers of the clean InSb (001) surface relative to the bulk atomic spacing.",
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AB - A time-of-flight (TOF) ion scattering and direct recoil spectrometer (ISS/DRS) has been developed to study the surface composition and reconstruction of metals, metal-oxides, and semiconductors, and to provide in situ characterization of the thin-film deposition process. The in situ, real-time study of Pb, Zr, and Ru ultrathin films produced by ion beam sputter deposition is presented here as the first demonstration of TOF-ISS as a means of characterizing monolayer and submonolayer growth, both in UHV and in mTorr oxygen background. The capability of performing surface analysis at pressures >10”3 Torr is unique to pulsed ion beam surface analysis among surface analytical methods and enables the in situ monitoring of oxide thin-film growth processes and surface-gas phase reactions. Using angular-resolved ISS combined with Auger electron spectroscopy, we studied the oxygen adsorption and reconstruction of (001) oriented InSb thin-film surfaces. It was found that the adsorption of molecular oxygen on the InSb (001) surface is consistent with the Langmuir model. Oxygen adsorption preferentially occurs on the antimony sites corresponding to the extension of the lattice into the vacuum and reduces the inward contraction of the first two layers of the clean InSb (001) surface relative to the bulk atomic spacing.

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